@misc{indiciaeba34072c4557,
  title = {The Einstein Observatory Extended Medium-Sensitivity Survey. I - X-ray data and analysis},
  author = {Gioia, I. M. and Maccacaro, T. and Schild, R. E. and Wolter, A. and Stocke, J. T.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900041511},
  note = {Source identifier: 19900041511}
}